Agressive would usually mean an attacking steep agile angles, old skool XC race style. I’m guessing that you mean slack angles for long travel forks and fun?
Might be useful to look at how things have evolved over the years then lessons learnt by the industry can be incoporated into the project.
I like the idea of the salsa woodsmoke, clearance for huge tyres, adjustable for smaller tyres, super short chainstays.
Of course designing the bike is only part of the challenge, getting everything jigged right to build a straight frame, and prepped/welded right so it is strong is the other part of the challenge. Personally i prefer the idea of laying up a carbon fibre frame rather than welding together a steel one 😉